You are looking at a rare copy of
VIDEOCASSETTE RECORDERS - THEORY AND SERVICING
by Gerald P. McGinty. This illustrated technical book on the operation and servicing of VHS and BETA VCRs is in very good condition; binding solid with no spine creasing; covers and all pages intact and in excellent condition with only several light instances of pencil underling and one light stain on the page edges. Published by McGraw-Hill; copyright 1979.